Commit d53dc388 authored by Minas Harutyunyan's avatar Minas Harutyunyan Committed by Greg Kroah-Hartman
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usb: dwc2: gadget: Fix sending zero length packet in DDMA mode. 



Sending zero length packet in DDMA mode perform by DMA descriptor
by setting SP (short packet) flag.

For DDMA in function dwc2_hsotg_complete_in() does not need to send
zlp.

Tested by USBCV MSC tests.

Fixes: f71b5e25 ("usb: dwc2: gadget: fix zero length packet transfers")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarMinas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Link: https://lore.kernel.org/r/967bad78c55dd2db1c19714eee3d0a17cf99d74a.1626777738.git.Minas.Harutyunyan@synopsys.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c4a0f7a6

drivers/usb/dwc2/gadget.c

+6 −4
Original line number Diff line number Diff line
@@ -2749,13 +2749,15 @@ static void dwc2_hsotg_complete_in(struct dwc2_hsotg *hsotg, 
		return;

	}



	/* Zlp for all endpoints, for ep0 only in DATA IN stage */

	/* Zlp for all endpoints in non DDMA, for ep0 only in DATA IN stage */

	if (hs_ep->send_zlp) {

		dwc2_hsotg_program_zlp(hsotg, hs_ep);

		hs_ep->send_zlp = 0;

		if (!using_desc_dma(hsotg)) {

			dwc2_hsotg_program_zlp(hsotg, hs_ep);

			/* transfer will be completed on next complete interrupt */

			return;

		}

	}



	if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_DATA_IN) {

		/* Move to STATUS OUT */